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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a648605a05cec5196045fdea73d19b274f4dceadcad21f9c269ac678bdc0475c' 
  AND token = 'tXkm4t0w/QGSChZX5aI1k3EpAphQCinnuqB8ukoceU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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