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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a0c339711141b52a326222ae2e6f171c87f24ee573aa18069351110e1fab61' 
  AND token = 'BO+l22+uDM6+QKiimDcfln3la0aWaQaln6nwolVYCk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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