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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87ea7a5256834c0e69e036812a9d98358e4948d5e1ed99194289eefecfd4a0e' 
  AND token = 'aDL+lhfUUVePRBTXnDiu6Yhdpa7xym7grPpKmiNS99M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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