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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5cd31a8c45a0fd4635064355689342a8658e5bb13536768de22d71ad5d087e' 
  AND token = 'R6+auQsc4Jy+54jpZNEJdr1bV1IrIyNdOqm3A2dF8ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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