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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3850f67e7b4e0303e0794b12a93af7202e3b4dc446742d938b1dd4a316b7391' 
  AND token = 'qTnXDb10Tc/Qqip7j5n4T2NeswhpcWu4pn6pdONxVV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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