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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5b215cba9b4a777777d7e47333205fc8991fb471ee7a516fbf2494e29145db' 
  AND token = 'hp2aO55nQRDO23t3a2M/AYJN1wjoQ+W6GNA9uHPCUZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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