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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1fa23e8b82bd48be9d25321e0f4a2fdcb4369db297de9ab0aebb9a5b070c61' 
  AND token = 'f5/coxg3hR3Hne+q9fX1bG+szbuvJX80xBSAV7lX6ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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