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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba25c242a7081832bfa0f5631036eef81fe3d71e084bdb4e8c0bd25dd030262c' 
  AND token = '+hRgy8svvd+NEYntMq/EtpU924wIN6vuRco2EVESvz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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