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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea1d13f840502392496910df0f0e32d7bcdb58a02620cc40ef58d61c36d0b17' 
  AND token = 'cwOrnpDr3LUu7PVdwITEF/vvac7xwxfz5JVHRLrFXyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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