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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719fe55f35fb0d226522a83a89b190e6e4ee6ed643595a9ecb7f4044416c403a' 
  AND token = 'bA2nJ/60mg6ulEppIntbXqbn3unrTF3hmejSdpq/jGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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