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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab833bf05f180b5f9deb7f91d00a7fb71c3aefbc81e87e7c4e3048e77c442d6' 
  AND token = 'zIL3nlt2a9+ZY5VpDOS+poA4AhhiztU+FynBxaXToB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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