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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7762e7da8ae430bbdc70b60ddb33e030dc85c388b0468c4f25bc30b844f96c8' 
  AND token = 'VmyL4/N2Ki1IL7SICD7+w918YUJhlOufoiJ/SlvcGCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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