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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d907fdfc6db65ab0c46a342936e1dc306b6beb586f2258ad2d80f9477c71b2e' 
  AND token = '6bFn2ilwZBdoxgaHvGT80J8hzDyNoXCxvyN/Ue8ciL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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