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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b373bc84cd97aa64432cf814a4c585ca1b544b6d2b6d6f91549fd3e8c9b131' 
  AND token = 'KLtxQlb+gMQ5Y0R0lR4Qg0RsJkBFy6t3E3q6EFcVTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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