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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55b7d0a8a1f6d2fbe15c70b738ca7e238f668985d6e9c4549896d907b87a2f0' 
  AND token = 'ezj+Yv1jWnH090KTz+2cNxDVAVRajUf1Bx5LL0Z/WNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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