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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756f7d3cb1f852140af3b434399445dcbaecc3b813022a1344bcbb16c51912fa' 
  AND token = '6r+bBtDvQWew/W6D75WCQR29Mvruis/KSzGZjbdiVkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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