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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4750be4d2394426a75e315eda262d2fcb82707aaa80a570fad82dcfca9590d8b' 
  AND token = 'oUwcmTa3LYdE+Bseg5mHIsn8lYjjy78PO8+3IOJ1k98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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