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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dd405a1c0b70489249f2a669fe1a28aff140693c3d13ea1acbf32e75a4a5df' 
  AND token = 'WcJEpjWaBxp3ja0YGT+FT5q5m4izItpVsuHe80xU8lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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