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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16781d0000c939ebb7edd2235fcb7d8f5ac4330bac1b2017fffc90b48eec962' 
  AND token = 'nYh18k4an7Z/vO4wQxPFcr0sapBiWtaV62muTxWVif4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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