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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7527ad00717318a5232f32b5226b6300cf639b2e485773cc716d002c953130' 
  AND token = 'l7ig/kId+q8mOyVpSEZ7ipnkQgr/74eQXmylHsZ95VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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