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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb54f18e5ad6a3826133863c993d39b8bcd572d5ddef8d1aa0d7dc41e79419aa' 
  AND token = 'njdKnnc2+3z4EQsZMcHRHh22973vGVIulw0gMZ9/RpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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