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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676113304c784939271b1d0ef70d08aef44e2f063f4e14f47363715d134a9214' 
  AND token = 'yn1FfAIQlfYchr3x6z4RWP4hhECoM5sWbG1w9PpOhrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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