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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78d2f70383d1a280e6b62c8a01079f9882e5c8f6f41bbaa894aa791dff348da' 
  AND token = 'mf+88JtrwkHHtOuHvE90Lx3cit1YJqc3CkIZGXXeq64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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