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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29be6819a12ee1078e38ff929b4fa72fc5153a37821edc032b32dfcab2bcf1a' 
  AND token = '15PGQpw+Blo6LDeBr3x3/1Twe8rjhV2103iUcZc7i0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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