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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fdd574bf2b4a81e24725f337727cd30a1cc2566e3bcb6e36e235f28884860e' 
  AND token = 'UCyw8z6KksEjTA/vHcxVmHQCspuiYmZzIreoIDQ8838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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