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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5cb5fcbe3ec2658a0474ac147ff80bde68fe4ace4e2e70edc0b28debd2c1bb' 
  AND token = 'brFN6NJqHSzECbvNTX+Zp3Vb5VkXLf3ogCDzFdIGF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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