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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188ff8def1b0aae28e15baeb508b16e852e4da8435dcf7fa9dfa3d4e38d33a9a' 
  AND token = 'fr9nmpCyZwIbd0IK4T7vd7OgJKbRJz9c27ddOYMtzHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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