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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ac0d10e664d3fde8cb70fa6e4f6e2d444f89888f66a3916ba91569d9d75ecb' 
  AND token = 'G9pPCJuNX5rheOOtuIHHyZ5Rk1tXdiOVG0+FCboL//I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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