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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fda54ffc9e02957a6e89f89ca1a074e240ddb4ef5c0bcff5d0cbb0286da18c1' 
  AND token = '3QzKZN9A/RSDtbRs4QoKPDGSBNPvgVg5Vc7yNxWhihY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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