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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb876bc5feab2a9bc10745a0fb4e50193e02ab7eb1085f0fe13dd9b3a9f4cdaa' 
  AND token = '04jzHkN7jpkk0uTF40o3YZ0bM5Fz7j2Kao7QjlY3Kyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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