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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624601527034a0e4671b08b82e474831447f2a1efd5c769b056f9f5fde25ddbc' 
  AND token = 'RgKl+oc2YsGaxc1T4iuE3PbvZaEiR7MZPzi8TllsNIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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