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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f198b2715b48820f8734ba5a10ecd7fe650758e8f32b42a40e805be660f8ab54' 
  AND token = '+F08BvY7ziGt6bHJAm7qzAelEADFmgo2CIPXRNUBRMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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