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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3f882e8f9ee3b1382eac692f9b65643bdcd3cf5fe12d918b936ce8e6b2b928' 
  AND token = 'kELKNgpwiG2PkzEpHb2MVCAXTi/lDmSjUkAS0tGea8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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