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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa60459a03c6dce702559c4e3a78c49a4eaf6fd2956d368787602e5fcb2340c' 
  AND token = '/t0jCudlRAZdabtyHBVMprCQq5FAnTjSJ+6HX/HGJIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}