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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d2c2f6478c45feec0fd439e8a01e01bc29aa78e3d7239d7f04c2e47875fc04' 
  AND token = 'bYozNoN2FPQTZwkhUZpA/quT5Dm90I0fu3k3oaUJ4Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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