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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0945d846659b104ba6f2e3b71efc04178f47072e931b2e6f1664ed39b704001d' 
  AND token = 'HLFUVmegHVdtmjZz+cxSrTbwMLa5+1vyczjIi51XPZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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