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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6212114c292a034debc30e348fde32bbd9ca6b00d3148ced2f2e757899ece93' 
  AND token = '7LVCuUgTWBpi1wjbZmFadhlh0Xa68rFLFQL9HmjZ7Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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