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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1894ddde85683cdf76b07c9147e7d65bfa15996f0e167c9e4b6f5610f936a9b0' 
  AND token = 'LgXWjdWLE0EfVGi2Y/3yfSgCqGtPh0aOSQXvm1zWU2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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