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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e07285f22ab35f04dab8b194e8df88d4bf3aaaca5aea2aa292e349e7b2ca0b' 
  AND token = 'zv+r1yhT/dFVqJMssaqYJcsxaG3tC06pBs9OluyCXf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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