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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c40c14f6e2ca276dbd9956b7d146067569a119e7d56d13158b05e6592389b6a' 
  AND token = 'naUR5s9yTQd+mjw4MyQ3I2Ddg7LpAMkhnrOySp07me0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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