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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987b6bda9288e888086ab4f9b3fc3cbe20f2ad086d4610b770f69dcd6c55559d' 
  AND token = 'FxV2ZN+4+fY4Q9/hP3GEOdU90Af4mQgJch78DYC1O38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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