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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c38a7e91604402f6e40f570ca70c1c71a82282b06ba69cef42ce89ffb381ecc' 
  AND token = 'kWPppjv+aK/in29/ULwaCDM1ScWnDRKTXCdWYQQC6Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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