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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f95df7cc3e57ef493e4060ee22109c4b12786c38827ba4488a0eb4e4f13dda7' 
  AND token = '3Bn/1FCCaEIRfllbqz01hA70GLyIOGLKJJVMfz7RWQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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