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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23178db77cbcb8ef00e85abdfbadc7345a2a0ec1426d61d608794ee193c31353' 
  AND token = '2U6548/Jbp2tH3PeCz7G0FjQ1EJmrkskRfKSgfi91ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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