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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b436fa3851c9b4e9b0f296eb5f11b9a11469652b90a88ba63d5950c33712f8' 
  AND token = 'ZUJygrVOH92tEiBfJQoN3PBqUv4QrYZXL6BoiiZqroA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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