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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37b9c9cfa345b38a38d6624f29f815f3179f5787d66c57d8af6f567583581b3' 
  AND token = 'JykNR+GEXd84FC7cjWhKt3Dpsa8q1zRTrA91IDCqxQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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