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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee987cacf3c272e9e0b5d112a9e90f3584b7e8699f1a9d89289f3f7eb1a46695' 
  AND token = '45LQfRiL5zdWg7nnJpJFCF4R1s6ZL7mdGRkNH+thn38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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