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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdb55c8c7a630597b1de04d92bac920224abbfec42bf630b8d2fbc76c0b5647' 
  AND token = 'oCBibsz/58yPKmd+k23XH9RTj0X9qE5V4fY2V8apvyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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