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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e262d2a64062da3d0d159747316d8904e2ed5b077ea8433b3dd90e876f32f70a' 
  AND token = 'ho98If+NPqCF2EMKafSwxn479w00EeXtOdQFtlEvBtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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